ISRO Successfully Conducts Sea Level Hot Test of Cryogenic Engine CE20 at 22 Tonne Thrust in TN
In March 2026, the Indian Space Research Organisation (ISRO) successfully conducted a 165-second sea level hot test of the Cryogenic Engine (CE20) at 22 tonne thrust using a Nozzle Protection System (NPS) and multi-element igniter at the ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu (TN).
In March 2026, the Indian Space Research Organisation (ISRO) successfully conducted a 165-second sea level hot test of the Cryogenic Engine (CE20) at 22 tonne thrust using a Nozzle Protection System (NPS) and multi-element igniter at the ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu (TN).
- The test supports the development of the uprated Cryogenic Stage (C32) for future missions of the Launch Vehicle Mark-3 (LVM3) and enhances the vehicle’s payload capability for upcoming space missions.
Highlights of CE20 Cryogenic Engine Sea-Level Test:
Upgrade: Operating the CE20 at 22-tonne thrust will enhance the payload capability of the LVM3, while earlier sea-level hot tests were conducted at 19-tonne thrust using the NPS.
Challenge: Sea-level testing is difficult due to the high area-ratio nozzle with an exit pressure of around 50 millibar (mbar), which can cause flow separation leading to vibrations, thermal stress, and possible mechanical damage.
Protection: The NPS was used to control flow separation effects and ensure safe sea-level testing of the high area-ratio nozzle.
Validation: The tested CE20 completed a record 20 hot tests, enabling qualification of multiple technologies using a single engine.
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